Gym is a place where you perform physical exercises and activities, often using Weights and equipments, typically to Build muscles or to stay fit. Gym exercises typically train and build particular groups of muscles. Various types of exercises are implemented to target different groups of muscles. Often, a Gym will be used by Bodybuilders and for weight loss. Gymnastics is a sport or activity where you build your balance, strength, flexibility, agility, endurance, control and learn to use and manipulate your body in a flexible way. To put it simply, gymnastics is the stuff where people roll, dive, tumble, flip in the air and many amazing maneuvers in ground as well in air. Better Google it for better understanding. read less